RI address not properly updated when SSU is disabled and --host is not set

[anonimal]

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• I have read and understood the contributor guide in kovri-docs.
• I have checked that the issue I am reporting can be replicated or that the feature I am suggesting is not present.
• I have checked opened or recently closed pull requests for existing solutions/implementations to my issue/suggestion.

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A known bug but now should be addressed sooner than later:

if --host is not set but SSU is enabled, our external IP address is found via SSU and RI is quickly updated. If SSU is disabled, the default host of 127.0.0.1 is set in the RI and is never updated. Some possible solutions:

1. running interface scanning code which has the potential to pick the wrong interface on multiple-interface systems. This is least ideal, so let's not do this.
2. piggy-back off of reseed (remote) to get external IP. We would need to fix the ordering of initialization though: reseed first then RI creation (it's currently the other way around). This is most ideal if the ordering is fixed.

Other solutions?

[anonimal]

NOTICE: THIS ISSUE HAS BEEN MOVED TO GitLab. Please continue the discussion there. See #1013 for details.